Bra size is such a pointless thing to care about. Not just because it's superficial, but because it's all relative. Two people can have the same bra size but one may be bigger due to having different shapes.

She looks like a 30D, 32C, or 32D to me depending on the picture. In some her breasts look bigger and some smaller. I'm assuming due to the ebb and flow of her cycle or she might wear a padded bra.In the first pic she could even be a 32DD maybe